import { AfterViewInit } from '@angular/core';
import { FormControl } from '@angular/forms';
import { PropertyWidget, Widget } from './widget';
export declare abstract class FileWidget<T extends Widget = Widget> extends PropertyWidget<T> implements AfterViewInit {
    protected reader: FileReader;
    protected filedata: any;
    fileName: FormControl;
    ngAfterViewInit(): void;
    onFileChange($event: any): void;
}